Virus Core

Virus Cores (ウィルスコア) are a type of Key Item in the Games Tetralogy. These items are not something regular players of The World are able to acquire under normal circumstances. The bearer of the Bracelet can use these items to unlock Protected Areas (Games Tetralogy). There are 26 types of Virus Cores, each of which is assigned a corresponding letter of the alphabet.

Virus Cores are extracted from some monsters using Data Drain. These are called Carrier Monsters, and they have the potential to mutate into Data Bugs. There are two kinds of Carrier Monsters: those who failed to become Data Bugs, and monsters undergoing the rewriting of their data. Carrier Monsters leave behind Virus Cores when they are data drained, but are otherwise indistinguishable from regular monsters. As The World becomes more corrupted, the rate of Carrier Monsters that successfully mutate into Data Bugs increases.

Morganna created Data Bugs by merging corrupted data with the pre-existing monster data within the game. This corrupted data is what constitutes the Virus Cores that are extracted from Carrier Monsters.

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